Great Loop bridge planning reference

Atchison Topeka & Santa Fe Railway Bridge

Atchison Topeka & Santa Fe Railway Bridge on Chicago Sanitary & Ship Canalnear Lemont, IL; closed clearance about 19.7 ft. Lowest unavoidable Great Loop bridge.

Planning awareness only: Bridge information is provided for planning awareness only. Always verify current bridge status, clearance, water levels, bridge schedules, opening restrictions, Local Notices to Mariners, bridge signage, and official charts before transit. FloatPlanWizard is not a navigation authority.

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41.65500000, -88.01100000

Planning only Fixed bridgeRailroad bridgeAir draft concern
WaterwayChicago Sanitary & Ship Canal
Route SegmentIllinois / Chicago
Route VariantInland Rivers / Chicago or Cal-Sag
State / ProvinceIL
Nearest CityLemont
Mile MarkerRM 300.5
Bridge TypeSwing railroad / does not open
Source Confidencemedium

Clearance And Opening Details

Vertical Clearance Closed19.70 ft
Vertical Clearance OpenNot verified
Horizontal Clearance160.00 ft
VHF ChannelNot verified
PhoneNot verified
Last Verified2026-06-08
Verify against current water level / bridge gauge before transit.

Planning Notes

Air Draft Notes
Closed/air-draft clearance: 19.7 ft. Datum/reference: Low Operating Level / Flat Pool; NGVD 1929. Clearance band: Route-limiting / Critical
Opening Schedule
Does not open.
Operator / Contact
Not verified
Navigation Notes
Does not open. Must clear to complete full Loop; no alternate route per AGLCA. Closed/air-draft clearance: 19.7 ft. Datum/reference: Low Operating Level / Flat Pool; NGVD 1929. Clearance band: Route-limiting / Critical Does not open.
Regulatory Notes
Does not open. Must clear to complete full Loop; no alternate route per AGLCA.